在Django中只渲染一个MultiWidget的一部分 [英] Render only one part of a MultiWidget in Django
问题描述
在模板中呈现表单时,使用方便的符号
{{formname.fieldname}}
用于渲染的单个字段。当我使用它的字段与MultiWidget,它将显示了HTML的输入元件。是否有将只显示第一HTML输入元件的表示法的一个轻微的修改? ( {{formname.fieldname.0}}
不起作用。)
我发现这个问题的解决方案需要两段代码。
首先
将MultiWidget转换为字符串的 render
方法相对较长。我们需要在最后一行复制并粘贴一个微小的修改,以使其重新生成数组。
class OurMultiWidget form.MultiWidget):
...
def render(self,name,value,attrs = None):
从原始渲染方法复制并过去
if self.is_localized:
for widget在self.widgets中:
widget.is_localized = self.is_localized
#value是一个值列表,每个对应一个小部件
#在self.widgets。
如果不是isinstance(value,list):
value = self.decompress(value)
output = []
final_attrs = self.build_attrs(attrs)
id_ = final_attrs.get('id',None)
for i,widget in enumerate(self.widgets):
try:
widget_value = value [i]
除了IndexError:
widget_value =无
如果id_:
final_attrs = dict(final_attrs,id ='%s_%s'%(id_,i))
output.append(widget.render (name +'_%s'%i,widget_value,final_attrs))
#原始:
#返回mark_safe(self.format_output(输出))
#只有这一行是由我自己写的:
return [mark_safe(self.format_output(x))for x in output]
第二个
在模板中写入 {{formname.fieldname}}
将自动调用场小号unicode的方法和治疗结果为字符串。当我们想要一个数组时,我们需要规避unicode方法并直接访问它将返回的内容。而这是方法 as_widget
。因此,要调用 OurMultiWidget
的第一部分,我们将在模板中需要此代码:
{{formname.fieldname.as_widget.0}}
I have a Django Form Field with a MultiWidget that consists of two TextInputs.
When rendering the form in a template there is the handy notation
{{ formname.fieldname }}
for rendering a single field. When I use it for the field with the MultiWidget, it will display both HTML input elements. Is there a slight modification of the notation that will display only the first HTML input element? ({{ formname.fieldname.0 }}
does not work.)
I found a solution to this problem that needs two pieces of code.
First
The render
method that turns the MultiWidget into a string is relatively long. We need to copy&paste it with a tiny modification in the last line to make it returing an array instead.
class OurMultiWidget(forms.MultiWidget):
...
def render(self, name, value, attrs=None):
"""Copy and past from original render method"""
if self.is_localized:
for widget in self.widgets:
widget.is_localized = self.is_localized
# value is a list of values, each corresponding to a widget
# in self.widgets.
if not isinstance(value, list):
value = self.decompress(value)
output = []
final_attrs = self.build_attrs(attrs)
id_ = final_attrs.get('id', None)
for i, widget in enumerate(self.widgets):
try:
widget_value = value[i]
except IndexError:
widget_value = None
if id_:
final_attrs = dict(final_attrs, id='%s_%s' % (id_, i))
output.append(widget.render(name + '_%s' % i, widget_value, final_attrs))
# Original:
# return mark_safe(self.format_output(output))
# Only this line was written by myself:
return [mark_safe(self.format_output(x)) for x in output]
Second
Writing {{ formname.fieldname }}
in the template will automatically call the field's unicode method and treat the result as a string. As we want an array instead, we need to circumvent the unicode method and access directly what it will return. And this is the method as_widget
. Thus, to call the first part of OurMultiWidget
, we will need this code in the template:
{{ formname.fieldname.as_widget.0 }}
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